Boiler-furnace construction.



Patented Sept. 12, 1916.

2 SHEETS-SHEET I BOILER FURNACE CONSTRUCTION.

APPLICATION FILE D NOV. 3, i9l5- D. F. HILL, G. L. KE ELY & C. D. LOHMAN.

In run: on. rnamurum. unngmc n a WWW D. F. HILL, G. L. KEELY & C. D. LOHMAN. BOILER FURNACEVCONSTRUCTION.

APPLICATION FILED. NOV. 3, I915.

1 1 98,226. Patented Sept. 12, 1916.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

DAVID F. I-IILL, GEORGE L. KEELY, AND CHARLES D. LOHMAN, OF INDIANAPOLIS, INDIANA.

' BOILER-FURNACE CONSTRUCTION.

Specification of Letters Patent.

Patented Sept. 12, 1916.

Application filed Novembe1'3, 1915. Serial No. 59,471.

T 0 all whom it may concern:

Be it known that we, DAVID F. HILL, GEORGE L. KEELY, and CHARLES D. LOH- MAN, citizens of the United States, residing at Indianapolis, Marion county, and State of Indiana, have invented and discovered certain new and useful Improvements in Boiler-Furnace Constructions, of which the following is a specification.

Our invention relates to front walls for furnaces, particularly downdraft boiler furnaces, and its object is to provide means for effectively protecting the brick pier of the arch of the front wall from the heat of the fire, thereby saving the cost of frequent renewals of the pier, and avoiding the inconvenience of loss of time due to the dismantling of the furnace to enable such renewals to be made.

\Vith the above objects in view our inven tion is embodied in preferable form in the construction hereinafter described and illustrated in the accompanying drawings.

In these drawings Figure 1 is a longitudinal section of a boiler furnace; Fig. 2, a front view in elevation; Fig. 3 a perspective view of the water jacket for the pier removed therefrom; Fig. 4, is a section on line 41 of Fig. 3.

Referring to the drawings the construction is shown as applied to a down-draft boiler furnace having forced draft means to which the invention in particularly applicable, although it is capable of use in connection with furnaces of other types. In this arrangement 1, 1 are the fuel doors, and 2 the ash doors. A forced draft fan 3 forces air through the twyer into the combustion chamber above the grate. The draft tends to direct a flame directly against the inner face of the central part of the front wall 5 of the furnace.

In the particular construction shown, the fuel is fed to the combustion chamber by an automatic stoking apparatus 6, mounted be tween the fuel doors, instead of through the openings of such doors.' The doors 2 are per end of which bears against and aids in supporting the arch S. This water jacket is adapted to be mounted just inside the outer metal shell or casing 11 of the front wall of the furnace.

It will be seen that the water jacket has vertical side walls and a vertical rear wall thus entirely inclosing and protecting the sides and inner face of the central pier. Owing to the fact that the jacket is ,narrower than either of the door spaces formed in the front wall for the admission of the fuel, it is possible to insert the jacket through one of these openings and thus readily attach the water jacket, and the construction is thus capable of being easily applied to furnaces already in use.

The water jacket is adapted to be connected with a source of cool water such as a pump 12 by means of an inlet pipe 13 and a return circulation is provided from the water jacket to unheated receiving means which may be either the pump or an elevated supply tank such as 14 or a waste basin. This return is effected by means of a pipe 15. By this arrangement the jacket is kept constantly cooled and the heating of the same above a temperature that would destroy its protecting function, as wouldbe the case were the jacket connected with the boiler circulation, is avoided.

In furnaces of the usual construction provided with a central fire brick pier and particularly with boiler furnaces of the forced down-draft type a flame of intense heat is constantly directed against the inner faceof the pier causing the brick work of said pier to burn out with comparative rapidity, which results in destroying the front wall and sometimes in letting down the arch, thus requiring the entire rebuilding of the front Wall. In our invention, this objecjection is entirely overcome as has been demonstrated in practical use and a great saving in cost of operation and in repairs is effected. By having the jacket connected only with the source of cold water supply, and an unheated return receiving means, the temperature therein is always maintained at a point below that which would produce liming or other deposit in the water jacket itself and thereby destroy the effectiveness of the latter. WVith this arrangement it has been found possible to keep the temperature of the water in the jacket down to 70 F. and less. Liming will take place at a temperature of approximately 160 F. and the effect thereof is to clog the jacket and the pipes communicating therewith.

7e are aware that it has been proposed to employ metallic water containers as a front wall or as part of the front wall of a boiler furnace for the purpose of providing a water heating receptacle intermediate the source of feed Water and the boiler, and with the incidental aim in view of keeping down the temperature of the Wall structure, but such arrangements are not designed for nor capable of accomplishing the function of our invention; since they do not serve as protecting means for the brick pier of the arch and since owing to their connection to the hot water of the boiler line and the induction of hot Water into the same by circulation from the boiler, it is impossible to maintain therein a temperature sufiiciently low to prevent liming and the consequent formation of clogging deposits.

Having thus described our invention, what we claim is:

1. In combination with a boiler furnace having a front wall against which the flame is directed from the fire, a. brick arch-supporting pier in the center of said Wall, and a removable U-shaped, metallic Water jacket having its separated ends at the front faces of the furnace and having a constant circu lation of cold water only through the same and surrounding the sides and inner face of the pier, said water jacket being supported on the dead-plates of the fuel openings, and said jacket in part supporting the said arch, and having its .front and side outer vertical face flush with the Wall of the arch and pier.

2. In combination with a boiler furnace having fuel doors in the front wall thereof, a brick pier between the doors of loss width than the opening of either door, and a substantially U-shaped water jacket of less width than either of said door openings and insertible through the same whereby the jacket is readily attachable, said jacket being adapted to inclose the sides and inner DAVID F. HILL. as GEORGE L. KEELY. [as] CHARLES D. LOHMAN. [n 3.

IVitnesses A. C. RICE, H. P. DOOLITTLE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G.

face of the pier when in place, and having 5 

